A hub air tightness detection device

Abstract

The utility model discloses a kind of wheel hub air tightness detection equipment, comprising: lifting frame, press down drive push rod and a pair of sealing fixture unit, sealing fixture unit includes mounting disc and annular rubber part, the mounting disc on the sealing fixture unit in upper position is provided with gas connection, annular rubber part includes the ring piece part and protruding portion that fit assembly on mounting disc, the width of the cross section of protruding portion gradually decreases along the direction of another group sealing fixture unit, the outer side wall of protruding portion is the arc wall that fits with rim crest, the rim crest of wheel hub will be fitted with corresponding ring piece part, and rim crest side wall will be pressed in arc wall extrude protruding portion, protruding portion is pressed after, protruding portion will be far from the axis of mounting disc bending to fit wheel hub, improve the contact area of annular rubber part and wheel hub, it is favorable to improve the sealing property when clamping, by the structure on annular rubber part design, it can reduce the clamping force required when clamping wheel hub, save energy.

Description

Technical Field

[0001] This utility model relates to the technical field of wheel hub testing, specifically to a wheel hub airtightness testing device. Background Technology

[0002] The air tightness test of wheel hubs is a crucial part of automobile manufacturing, repair and quality control. The wheel hub and tire together form a closed air chamber to hold compressed air to support the weight of the vehicle and provide cushioning. If there is a leak in the wheel hub itself, even if the tire itself is intact, the entire wheel system will leak air slowly or quickly.

[0003] Common methods for testing wheel hub air tightness include the waterless air pressure test and the water test. The water test involves clamping the wheel hub with a fixture mounted on a lifting frame or a water tank mounted on a lifting frame. The fixture is moved downward or the water tank is moved upward, immersing the wheel hub in water. Air is then injected into the inside of the wheel hub through the fixture to increase the internal air pressure. The surface of the wheel hub is then checked for air bubbles. If no air bubbles are found, the wheel hub has good air tightness. If air bubbles are found on the outer wall of the wheel hub, it indicates that the wheel hub has pores and does not meet the factory quality requirements.

[0004] Chinese patent application CN202421889506.8, entitled "An Airtightness Testing Device for Automobile Wheel Hubs," discloses an airtightness testing device for automobile wheel hubs. Both the upper and lower pressure plates are equipped with annular sealing rings. When the wheel hub is clamped, only the upper or lower surface of the wheel rim protrusion contacts the corresponding sealing ring. The sealing performance of the clamping is maintained by the clamping force. Maintaining a high-pressure clamping force requires a lot of energy, so it is necessary to design an airtightness testing device for wheel hubs. Utility Model Content

[0005] To address the aforementioned technical problems, the purpose of this utility model is to overcome the shortcomings of existing technologies.

[0006] To achieve the above objectives, this utility model provides a wheel hub air tightness testing device, comprising: a lifting frame, a downward drive push rod mounted on the top of the lifting frame, and a pair of sealing clamp units arranged symmetrically and respectively mounted on the bottom of the lifting frame and the moving end of the downward drive push rod.

[0007] The sealing clamp unit includes a mounting plate and a coaxial sealing assembly on the side of the mounting plate near another sealing clamp unit. The mounting plate on the upper sealing clamp unit is provided with an air inlet located inside the annular rubber component.

[0008] The annular rubber component includes an annular portion fitted onto the mounting plate and a protrusion coaxially fitted onto the middle of the annular portion. The width of the cross-section of the protrusion gradually decreases along the direction close to another set of sealing clamp units, and the outer wall of the protrusion is an arc-shaped wall that fits against the rim peak.

[0009] Preferably, the annular portion has a plurality of concentrically arranged annular protrusions protruding on the side near the mounting plate. The cross-section of the annular protrusions is trapezoidal. The mounting plate has an annular groove corresponding to the annular protrusions. One of the annular protrusions corresponds to the connection between the arc-shaped wall and the annular piece.

[0010] Preferably, the cross-section of the annular groove is trapezoidal, and the depth of the annular groove is less than the height of the annular protrusion.

[0011] Preferably, a first ring plate is assembled on the mounting plate by a plurality of first mounting bolts, and the outer edge of the first ring plate is pressed against the inner edge of the ring plate portion;

[0012] The mounting plate is fitted with a second ring plate by a number of second mounting bolts, and the inner edge of the second ring plate is pressed against the outer edge of the ring plate portion.

[0013] Preferably, the mounting plate has a coaxial recessed annular mounting groove, the second ring piece is located in the mounting groove, the side wall of the mounting groove near the axis of the mounting plate is inclined to form an inclined wall, and the inner edge of the second ring piece has an inclined portion that cooperates with the inclined wall to clamp the outer edge of the ring piece.

[0014] Preferably, an annular support portion is coaxially protruding on the side of the annular protrusion away from the annular plate portion, the height of the annular support portion and the annular protrusion is greater than the depth of the annular groove, and the width of the annular support portion is less than the width of the annular groove.

[0015] Preferably, the lifting frame is equipped with several vertical guide rods, and the mounting plate in the sealing clamp unit located above is fixedly connected with a sliding sleeve that is slidably sleeved on the corresponding guide rod.

[0016] According to the above technical solution, the wheel hub air tightness testing device provided by this utility model has the following beneficial effects when in use:

[0017] Firstly, the rim protrusion of the wheel hub fits into the corresponding ring plate, and the side wall of the rim protrusion presses against the arc wall, applying a vertical force to the arc wall, thereby squeezing the protrusion. After being compressed, the protrusion bends away from the axis of the mounting plate to fit the wheel hub, increasing the contact area between the annular rubber component and the wheel hub, which is beneficial to improving the sealing performance during clamping. Through the structural design of the annular rubber component, the clamping force required when clamping the wheel hub can be reduced, saving energy.

[0018] Secondly, when the air pressure inside the wheel hub is greater than the air pressure outside, the air pressure will also exert force on the side wall of the protrusion near the axis of the mounting plate. This force will cause the protrusion to be pressed more tightly against the inner side wall of the wheel hub, improving the sealing performance during clamping.

[0019] Thirdly, the protrusion also serves a positioning function. When placing the wheel hub, the wheel hub rim protrusion is fitted onto the outside of the protrusion, and the width of the cross-section of the protrusion gradually decreases along the direction closer to another set of sealing clamp units. This is beneficial for the protrusion to deform and fit against the wheel hub sidewall, and also for the wheel hub to be positioned and placed.

[0020] Other features and advantages of this utility model will be described in detail in the following detailed description section; and all parts not covered in this utility model are the same as or can be implemented using existing technology. Attached Figure Description

[0021] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the following detailed description to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0022] Figure 1 This is a three-dimensional structural diagram of a wheel hub airtightness testing device provided in this utility model;

[0023] Figure 2 This is a three-dimensional structural diagram of the sealing fixture unit of a wheel hub airtightness testing device provided in this utility model;

[0024] Figure 3 This is a cross-sectional view of the sealing fixture unit of a wheel hub airtightness testing device provided in this utility model;

[0025] Figure 4 This utility model provides a wheel hub airtightness testing device. Figure 3 Enlarged diagram of point A in the middle.

[0026] Explanation of reference numerals in the attached figures

[0027] 1. Lifting frame; 2. Downward drive push rod; 3. Mounting plate; 4. Annular rubber part; 5. Air inlet; 6. Ring plate part; 7. Protrusion part; 8. Arc-shaped wall; 9. Annular protrusion; 10. Annular groove; 11. First ring plate; 12. Second ring plate; 13. Mounting groove; 14. Inclined part; 15. Annular support part; 16. Guide rod; 17. Sliding sleeve. Detailed Implementation

[0028] The specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of this utility model.

[0029] In this utility model, unless otherwise stated, directional words such as "upper," "lower," "inner," and "outer" included in the terminology only represent the orientation of the term in its conventional use or are common terms understood by those skilled in the art, and should not be regarded as limitations on the term.

[0030] like Figure 1-4 As shown, a wheel hub air tightness testing device includes: a lifting frame 1, a downward drive push rod 2 mounted on the top of the lifting frame 1, and a pair of sealing clamp units arranged symmetrically and respectively mounted on the bottom of the lifting frame 1 and the moving end of the downward drive push rod 2.

[0031] The sealing clamp unit includes a mounting plate 3 and a coaxial sealing assembly on the side of the mounting plate 3 near another sealing clamp unit. The mounting plate 3 on the upper sealing clamp unit is provided with an air inlet 5 located inside the annular rubber component 4.

[0032] The annular rubber component 4 includes an annular portion 6 fitted onto the mounting plate 3 and a protrusion 7 coaxially fitted onto the middle of the annular portion 6. The width of the cross-section of the protrusion 7 gradually decreases along the direction close to another set of sealing clamp units, and the outer wall of the protrusion 7 is an arc-shaped wall 8 that fits against the rim peak.

[0033] In the above technical solution, the vertical moving mechanism that drives the lifting frame 1 to move up and down is an existing mature technology and can adopt a screw slide structure. The gas supply device is an existing mature technology and is used to connect to the gas inlet 5. It generally includes a compressor, an air filter, a solenoid valve, a flow control valve, a safety valve, an exhaust valve, and a pressure setting and control system.

[0034] During testing, the downward drive push rod 2 will move the upper sealing clamp unit downwards, cooperating with the lower sealing clamp unit to hold the wheel hub. The gas supply device increases the air pressure inside the wheel hub, and the vertical moving mechanism drives the lifting frame 1 downwards, so that the wheel hub is immersed in water. Observe whether there are air bubbles on the outside of the wheel hub.

[0035] The rim protrusion of the wheel hub fits into the corresponding ring plate 6, and the side wall of the rim protrusion presses against the arc-shaped wall 8, applying a vertical force to the arc-shaped wall 8, thereby squeezing the protrusion 7. Due to the material properties of the rubber itself, when the rubber is squeezed, the surrounding material flows towards the center of the pressure area, which macroscopically manifests as bending. After being compressed, the protrusion 7 bends away from the axis of the mounting plate 3 to fit the wheel hub, increasing the contact area between the annular rubber part 4 and the wheel hub, which is beneficial to improving the sealing performance during clamping. Through the structural design of the annular rubber part 4, the clamping force required when clamping the wheel hub can be reduced, saving the energy required to maintain the sealing clamping.

[0036] When the air pressure inside the wheel hub is greater than the air pressure outside, the air pressure will also exert a force on the side wall of the protrusion 7 near the axis of the mounting plate 3. The force will cause the protrusion 7 to be pressed more tightly against the inner side wall of the wheel hub, improving the sealing performance during clamping.

[0037] The protrusion 7 also serves a positioning function. When placing the wheel hub, the wheel hub rim protrusion is fitted onto the outside of the protrusion 7, and the width of the cross-section of the protrusion 7 gradually decreases along the direction closer to another set of sealing clamp units. This is beneficial for the protrusion 7 to deform and fit into the side wall of the wheel hub, and also for the positioning and placement of the wheel hub.

[0038] In a preferred embodiment of the present invention, a plurality of concentric annular protrusions 9 are provided on the side of the annular plate portion 6 near the mounting plate 3. The cross-section of the annular protrusions 9 is trapezoidal. The mounting plate 3 is recessed with an annular groove 10 corresponding to the annular protrusions 9. One of the annular protrusions 9 corresponds to the connection between the arc-shaped wall 8 and the annular plate.

[0039] In the above technical solution, the cross-sections of the annular protrusion 9 and the annular groove 10 are both trapezoidal, and one of the annular protrusions 9 corresponds to the connection between the arc-shaped wall 8 and the annular piece, that is, the rim protrusion presses against the annular protrusion 9. After the annular protrusion 9 is subjected to force, it will tightly fit the inner wall of the annular groove 10, thereby improving the sealing performance during clamping.

[0040] In a preferred embodiment of this utility model, the cross-section of the annular groove 10 is trapezoidal, and the depth of the annular groove 10 is less than the height of the annular protrusion 9.

[0041] In the above technical solution, when the annular protrusion 9 is squeezed, it will fit against the inner wall of the annular groove 10. When the depth of the annular groove 10 is less than the height of the annular protrusion 9, a sealed space will be formed at the bottom of the annular groove 10. After being deformed and squeezed by the annular protrusion 9, the air in the sealed space will be compressed and the air pressure will be increased. The air pressure will then have a reaction force on the annular protrusion 9, increasing the force between the annular protrusion 9 and the side wall of the annular groove 10.

[0042] In a preferred embodiment of the present invention, a first ring plate 11 is assembled on the mounting plate 3 by a plurality of first mounting bolts, and the outer edge of the first ring plate 11 is pressed against the inner edge of the ring plate portion 6;

[0043] The mounting plate 3 is fitted with a second ring plate 12 by a number of second mounting bolts, and the inner edge of the second ring plate 12 is pressed against the outer edge of the ring plate portion 6.

[0044] In a preferred embodiment of the present invention, the mounting plate 3 is provided with a coaxial recessed annular mounting groove 13, the second ring piece 12 is located in the mounting groove 13, the side wall of the mounting groove 13 near the axis of the mounting plate 3 is inclined to form an inclined wall, and the inner edge of the second ring piece 12 is provided with an inclined portion 14 that cooperates with the inclined wall to clamp the outer edge of the ring piece portion 6.

[0045] In the above technical solution, the mounting groove 13 can hide the second ring plate 12, so as to prevent the wheel rim protrusion from contacting the second ring plate 12 and the second mounting bolt when placing the wheel hub, which would cause damage or marks to it. Therefore, the mounting groove 13 can prevent the wheel rim protrusion from contacting the second ring plate 12 and the second mounting bolt, thus protecting the wheel hub when placing it.

[0046] In a preferred embodiment of the present invention, an annular support portion 15 is coaxially protruding from the side of the annular protrusion 9 away from the annular plate portion 6. The height of the annular support portion 15 and the annular protrusion 9 is greater than the depth of the annular groove 10, and the width of the annular support portion 15 is less than the width of the annular groove 10.

[0047] In the above technical solution, the annular support 15 will act on the annular protrusion 9 after being squeezed, causing the annular protrusion 9 to deform and squeeze the side wall of the annular groove 10. If there is no annular support 15, the annular protrusion 9 will deform towards the bottom of the annular groove 10 and protrude. However, by providing the annular support 15, the deformation force can be applied to the side wall of the annular groove 10.

[0048] In a preferred embodiment of this utility model, the lifting frame 1 is equipped with a plurality of vertical guide rods 16, and the mounting plate 3 in the sealing clamp unit located above is fixedly connected to a sliding sleeve 17 that is slidably sleeved on the corresponding guide rod 16.

[0049] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the specific details of the above embodiments. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, and these simple modifications all fall within the protection scope of the present invention.

[0050] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable way without contradiction. In order to avoid unnecessary repetition, this utility model will not describe the various possible combinations separately.

[0051] Furthermore, various different embodiments of this utility model can be combined in any way, as long as they do not violate the spirit of this utility model, they should also be regarded as the content disclosed by this utility model.

Claims

1. A wheel hub airtightness testing device, characterized in that, include: The lifting frame (1), the downward drive push rod (2) mounted on the top of the lifting frame (1), and a pair of symmetrically arranged sealing clamp units mounted on the bottom of the lifting frame (1) and the moving end of the downward drive push rod (2) respectively; The sealing clamp unit includes a mounting plate (3) and a coaxial sealing assembly on the side of the mounting plate (3) near another sealing clamp unit. The mounting plate (3) on the upper sealing clamp unit is provided with an air inlet (5) located inside the annular rubber part (4). The annular rubber part (4) includes an annular portion (6) fitted onto the mounting plate (3) and a protrusion (7) coaxially fitted onto the middle of the annular portion (6). The width of the cross-section of the protrusion (7) gradually decreases along the direction close to another set of sealing clamp units. The outer wall of the protrusion (7) is an arc-shaped wall (8) that fits against the rim peak.

2. The wheel hub airtightness testing device according to claim 1, characterized in that, The annular plate (6) has several concentric annular protrusions (9) protruding on the side near the mounting plate (3). The cross-section of the annular protrusions (9) is trapezoidal. The mounting plate (3) has an annular groove (10) corresponding to the annular protrusions (9). One of the annular protrusions (9) corresponds to the connection between the arc wall (8) and the annular plate.

3. The wheel hub airtightness testing device according to claim 2, characterized in that, The cross-section of the annular groove (10) is trapezoidal, and the depth of the annular groove (10) is less than the height of the annular protrusion (9).

4. The wheel hub airtightness testing device according to claim 1, characterized in that, The mounting plate (3) is fitted with a first ring plate (11) by a number of first mounting bolts, and the outer edge of the first ring plate (11) is pressed against the inner edge of the ring plate portion (6); The mounting plate (3) is fitted with a second ring plate (12) by a number of second mounting bolts, and the inner edge of the second ring plate (12) is pressed against the outer edge of the ring plate portion (6).

5. The wheel hub airtightness testing device according to claim 4, characterized in that, The mounting plate (3) is coaxially recessed with an annular mounting groove (13), and the second ring piece (12) is located in the mounting groove (13). The side wall of the mounting groove (13) near the axis of the mounting plate (3) is inclined to form an inclined wall. The inner edge of the second ring piece (12) is provided with an inclined part (14) that cooperates with the inclined wall to clamp the outer edge of the ring piece part (6).

6. The wheel hub airtightness testing device according to claim 2, characterized in that, The annular protrusion (9) is coaxially provided with an annular support (15) on the side away from the annular plate (6). The height of the annular support (15) and the annular protrusion (9) is greater than the depth of the annular groove (10), and the width of the annular support (15) is less than the width of the annular groove (10).

7. The wheel hub airtightness testing device according to claim 1, characterized in that, The lifting frame (1) is equipped with several vertical guide rods (16), and the mounting plate (3) in the sealing clamp unit above is fixedly connected with a sliding sleeve (17) that is slidably sleeved on the corresponding guide rod (16).

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